An introduction to the science & practice of photography (1895)
Jones, Henry Chapman, 1854- · London, Iliffe, Sons & Sturmey Ltd · leaf 146
meniscus. The optical centre of a plano-convex is on the curved surface ; in the case of a meniscus it is outside the lens altogether. In using a single landscape lens, therefore, the distance between the back of the lens and the focussing screen is equal to or greater than the equivalent focal… … IG. 44. two too small for the former, though the focal lengths of both lenses are the same. In those cases where the optical centre is on the surface of the lens or outside it, the optical centre is identical with the point of admission or emission, as the case may be, and the position of the other…
Photography
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